Thanks for the info. So the rear shroud can be removed. Is the Novak sight large enough to cover the milled cut out for the protected sight? ie. does it still look like a factory fit with just a Novak type sight?

Just noticed this from that site:

"This is the Early Solid Stainless Steel Frame and Slide, not the later Alloy Frame made to look like Stainless steel"

Which 4006 is the alloy frame?